Chain saw



Sept. 7 1926.

J. DAW

CHAIN SAW Original Filed Sept. 11, 1924 PIC-1".

NVENTOR a t x Patented Sept. 7, 1926.

UNITED STATES PATEN OFFICE.

JOSEPH DAW, or QUEBEC, QUEBEC, CANADA, ASSIGNOR TO BROWN COMPANY, orBERLIN, NEW HAMPSHIRE.

CHAIN SAW.

' August 5, 1925.

lhe invention relates to a chain saw as.

described in the present specification and illustrated in theaccompanying drawings that form part.- of the same.

The. invention consists essentially of the novel features ofconstruction pointed out broadly and specifically in the claims fornovelty following a description in detail'ot an acceptable form of theinvention.

The objectsof the invention are to facilitate the felling of treesparticularly those of the smaller diameter used in the manufacture ofpaper stock; to insure eelerity and etliciency; to enable the workman topass from tree to tree and thus cover large areas of timber in acomparatively short period in respect to other methods of felling: tosim 'ilify the inechanisn'i in such devices and therebv reduce the costof maintenance and avoid delays in the matter of effecting repairs; tofurnish a readily'portable saw for various purposes such as for metaland stone cutting and other industrial or domestic work, and generallyto provide a serviceable and durable saw easy to operate and effectivein its work.

In the drawings Figure 1 is a plan view of the assembled mechanism.

Figure 2 is a detail showing an enlarged fragmentary detail of the saw.

Figure 3 is a cross sectional View of the chain saw on the line 33 inFigure 1.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawings the saw cutting teeth are preferably formed indetached sets, each set being shown as having the projecting aligninglugs 13 and 14 from the one end and the bevelled aligning slots 15 and16 at the other end in opposite sides.

The blade section 11 is reduced in thickness at the upper end 17 andthese reduced ends form the arc-shaped driving teeth 18, which areintended to be engaged by corresponding sprocket wheels.

The chain sections 17 are formed with the link slots 19 and 20 from theends respectively, these slots being part circular and cut away at theedges 21 and having flaring open ends 22.

The link bars 23 forming the joint members in connecting the severalunits to make Divided and this application filed Serial No. 48,405.

an endless chain are inserted in the slots 1.9 and 20 of ditferentunitsand the enlarged rounded ends 2t and 25 of said bars which areslightly grooved in the centre of their peripheries and trimmed at theedges, are forced into the convexly walled slots 19 and 20, to hold thelinks and chain sections flexibly together.

It will now be seen that the endless chain formed by the blade sectionspresents an outer cutting edge for the complete length of the chain anda toothed back forming an operating back also for the complete length ofthe chain on the inner side.

In the operation of this saw it will thus be seen that when it is beingdriven the sections of the chain saw will always be maintained inconstant alignment by the aligning lugs 13 and 14. It will also be seenthat when one of the chain sect-ions has been broken it can very easilybe changed and thus very little time is lost in both the cutting and therepairing operations.

hat I claim is 1. In a power saw, a portable frame containing a gear andsprocket driving mechanism, and a chain saw mounted in said frame andhaving backs to the teeth engaging said sprocket mechanism and linksjoining the teeth members through disk ends slightly grooved to fit inthe teeth.

2. In a power saw, a portable frame containing a gear and sprocketdriving mechanism, and a chain saw mounted in said frame and havingsections formed on the outside with cutting teeth, aligning slots andlugs, link bearing slots having flaring outer ends and bar links havingenlarged ends bearing said link.

3. In a power saw, a portable frame containing a gear and sprocketdriving mechanism, and a chain saw mounted in said frame and havinglinked and centrally slotted sections with cutting teeth on the one sideand driving teeth on the other and engaged by said sprocket mechanism,said links joining the teeth members through disk ends grooved andcoacting with convex walls in said slots.

4. In a power saw, a portable frame containing a gear and sprocketdriving mechanism and a chain saw mounted in said frame andcomprisingsectional saw pieces and links mounted in part circular slotstherein and joining the teeth members through disk ends in convex andconcave joints.

5. In a power saw, a portable frame containing a gear and sprocketdriving mechanism, and a chain saw in said frame and formed of teethsections having link bearing slots extending inwardly from each end andbevelled at the edges and teeth projecting from the backs, and linksjoining the teeth members through disk ends in convex and concavejoints.

6. In a power saw, a portable frame containing a gear and sprocketdrivin mechanism, a chain saw mounted 1n said frame and con'iprisingcutting teeth on the one side and sprocket teeth on the other and linksjoining the teeth members through disk ends in convex and concave oints.

7. In a power saw, a portable frame containin a gear and sprocketdriving mechanism, a chain saw mounted in said frame and comprising aplurality of saw members, each member having aligning projections andslots adapted to maintain the adjoining sections flush with one another,and

links joining the teeth members through disk ends in tongued and groovedjoints.

. 8. In a power saw, a portable frame con-' taining a gear and sprocketdriving mechanism, a chain mounted in said frame and comprising aluralit of saw members, each member liaving bevelled lugs flush with theface at one side and bevelled slots atthe otherside for the lugs from anad joini'ng member to bring the faces of the neighboring member flushand ri id one with the other, and links joining t e teeth membersthrough disk ends in tongued and grooved joints.

9. In a power saw, a portable frame containing a gear and sprocketdriving mechanism, a chain saw mounted in said frame and comprising aplurality of saw members having their backs of reduced thickness andforming a projecting tooth, a follower bar of the same thickness as thesaw members and having a slot receiving said tooth and links joining theteeth members through disk ends in tongued and grooved oints.

Signed at Quebec this 20th day of March JOSEPH DAW.

